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# Add watermark to PDF using C#
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The [Syncfusion .NET PDF Library](https://www.syncfusion.com/document-processing/pdf-framework/net/pdf-library) provides support to add watermark as an image or text that is added to a PDF document to indicate the authenticity or ownership of the document. The library provides APIs for programmatically adding watermarks to PDF documents, with options for specifying the position, size, and opacity of the watermark.
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The [Syncfusion® .NET PDF Library](https://www.syncfusion.com/document-processing/pdf-framework/net/pdf-library) provides support to add watermark as an image or text that is added to a PDF document to indicate the authenticity or ownership of the document. The library provides APIs for programmatically adding watermarks to PDF documents, with options for specifying the position, size, and opacity of the watermark.
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* Run the application.
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# Resources
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***Product page:**[Syncfusion PDF Framework](https://www.syncfusion.com/document-processing/pdf-framework/net)
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***Documentation page:**[Syncfusion .NET PDF library](https://help.syncfusion.com/file-formats/pdf/overview)
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***Online demo:**[Syncfusion .NET PDF library - Online demos](https://ej2.syncfusion.com/aspnetcore/PDF/CompressExistingPDF#/bootstrap5)
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***Blog:**[Syncfusion .NET PDF library - Blog](https://www.syncfusion.com/blogs/category/pdf)
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***Knowledge Base:**[Syncfusion .NET PDF library - Knowledge Base](https://www.syncfusion.com/kb/windowsforms/pdf)
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***EBooks:**[Syncfusion .NET PDF library - EBooks](https://www.syncfusion.com/succinctly-free-ebooks)
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***FAQ:**[Syncfusion .NET PDF library - FAQ](https://www.syncfusion.com/faq/)
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***Product page:**[Syncfusion® PDF Framework](https://www.syncfusion.com/document-processing/pdf-framework/net)
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***Documentation page:**[Syncfusion® .NET PDF library](https://help.syncfusion.com/file-formats/pdf/overview)
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***Online demo:**[Syncfusion® .NET PDF library - Online demos](https://ej2.syncfusion.com/aspnetcore/PDF/CompressExistingPDF#/bootstrap5)
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***Blog:**[Syncfusion® .NET PDF library - Blog](https://www.syncfusion.com/blogs/category/pdf)
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***Knowledge Base:**[Syncfusion® .NET PDF library - Knowledge Base](https://www.syncfusion.com/kb/windowsforms/pdf)
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***EBooks:**[Syncfusion® .NET PDF library - EBooks](https://www.syncfusion.com/succinctly-free-ebooks)
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***FAQ:**[Syncfusion® .NET PDF library - FAQ](https://www.syncfusion.com/faq/)
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# Support and feedback
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* For any other queries, reach our [Syncfusion support team](https://www.syncfusion.com/support/directtrac/incidents/newincident?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples) or post the queries through the [community forums](https://www.syncfusion.com/forums?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples).
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* Request new feature through [Syncfusion feedback portal](https://www.syncfusion.com/feedback?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples).
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* For any other queries, reach our [Syncfusion® support team](https://www.syncfusion.com/support/directtrac/incidents/newincident?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples) or post the queries through the [community forums](https://www.syncfusion.com/forums?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples).
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* Request new feature through [Syncfusion® feedback portal](https://www.syncfusion.com/feedback?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples).
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# License
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This is a commercial product and requires a paid license for possession or use. Syncfusion’s licensed software, including this component, is subject to the terms and conditions of [Syncfusion's EULA](https://www.syncfusion.com/eula/es/?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples). You can purchase a licnense [here](https://www.syncfusion.com/sales/products?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples) or start a free 30-day trial [here](https://www.syncfusion.com/account/manage-trials/start-trials?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples).
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# About Syncfusion
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Founded in 2001 and headquartered in Research Triangle Park, N.C., Syncfusion has more than 26,000+ customers and more than 1 million users, including large financial institutions, Fortune 500 companies, and global IT consultancies.
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Founded in 2001 and headquartered in Research Triangle Park, N.C., Syncfusion® has more than 26,000+ customers and more than 1 million users, including large financial institutions, Fortune 500 companies, and global IT consultancies.
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Today, we provide 1600+ components and frameworks for web ([Blazor](https://www.syncfusion.com/blazor-components?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [ASP.NET Core](https://www.syncfusion.com/aspnet-core-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [ASP.NET MVC](https://www.syncfusion.com/aspnet-mvc-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [ASP.NET WebForms](https://www.syncfusion.com/jquery/aspnet-webforms-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [JavaScript](https://www.syncfusion.com/javascript-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [Angular](https://www.syncfusion.com/angular-ui-components?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [React](https://www.syncfusion.com/react-ui-components?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [Vue](https://www.syncfusion.com/vue-ui-components?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), and [Flutter](https://www.syncfusion.com/flutter-widgets?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples)), mobile ([Xamarin](https://www.syncfusion.com/xamarin-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [Flutter](https://www.syncfusion.com/flutter-widgets?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [UWP](https://www.syncfusion.com/uwp-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), and [JavaScript](https://www.syncfusion.com/javascript-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples)), and desktop development ([WinForms](https://www.syncfusion.com/winforms-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [WPF](https://www.syncfusion.com/wpf-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [WinUI(Preview)](https://www.syncfusion.com/winui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples), [Flutter](https://www.syncfusion.com/flutter-widgets?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples) and [UWP](https://www.syncfusion.com/uwp-ui-controls?utm_source=github&utm_medium=listing&utm_campaign=github-docio-examples)). We provide ready-to-deploy enterprise software for dashboards, reports, data integration, and big data processing. Many customers have saved millions in licensing fees by deploying our software.
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